JP2004189425A - Driving mechanism in inversion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably transmit the drive force without increasing any external dimensions such as the height and the width of a chain driving mechanism. <P>SOLUTION: In an inversion device comprising a rotary table having a circular outer circumferential portion forming a rotating surface and an article loading part inward of the outer circumferential portion, a support roll in contact with the rotating surface to rotatably support the rotary table, and a rotation-drive unit having a chain pulled along the circular outer circumferential part and a chain wheel with the chain stretched therearound, a link chain 21 is used for the chain, and a cross-loop part 22 with middle portions of the link chain 21 across each other is provided. A driving chain wheel 24 and a driven chain wheel 23 are arranged in an axially offset manner so that the link chain 21 is not brought into contact with a cross part 25. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a turntable having a circular outer peripheral portion serving as a rotating surface, and having a mounting portion for articles inside the outer peripheral portion, and a support roll that is in contact with the rotating surface and rotatably supports the turntable. And a drive mechanism in a reversing device provided with a rotation drive unit having a chain stretched along a circular outer peripheral portion and a chain wheel around which the chain is wound.
[0002]
[Prior art]
As this kind of reversing device, there is one disclosed in Japanese Utility Model Publication No. 4-47136. In this device, as shown in FIG. A method of using X, X to wrap around the drive axis Y has been adopted. However, in this method, there is a space problem in connecting a motor shaft having a high reduction ratio to the drive shaft Y, and if the motor shaft is arranged laterally as in the above-mentioned invention, one motor shaft is added.
[0003]
On the other hand, as shown in FIG. 8B, when the drive shaft Z is hung around the position where the chain V is pulled out sideways using the idling shaft X, as shown in FIG. It can be seen that the problem is solved. However, the approach portion W of the chain V is generated, and the drive unit (motor or the like) projects outward by arranging the drive shaft Z to the side to avoid it. The problem arises.
[0004]
[Problems to be solved by the invention]
The present invention has been made by paying attention to the above points, and an object of the present invention is to make it possible to surely transmit a driving force without expanding an external dimension such as a height and a width of a chain driving mechanism. It is.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a reversing device including a chain and a rotation drive unit having a chain wheel around which the chain is wound. A means is provided in which a cross-loop portion in a loop shape is provided, and a driving chain wheel and a driven chain wheel are arranged so as to be displaced in the axial direction so that the link chain does not contact at the cross portion. It is a thing.
[0006]
The reversing device includes a rotary table having a cylindrical outer peripheral portion serving as a rotary surface, and having a mounting portion of the article inside the outer circumference, and the rotary table is supported in contact with the rotary surface. It is rotatably supported by a roll. The chain shall be stretched along the circumference of such a turntable. In this case, as shown in FIG. 7 (a), it is ideal to make a reciprocating motion with one drive shaft, but it is difficult to avoid cross contact at point P, and this method is difficult. .
[0007]
Therefore, in the present invention, as shown in FIG. 7 (b), by combining one drive shaft D and one idle shaft F, a technique for avoiding cross contact of the chain was developed, and the object was achieved. In the present invention, one condition is that a roller chain conventionally used is eliminated and a link chain is applied. This is because the link chain has flexibility with respect to the inclination of the chain in the direction in which the chain is stretched, and there is no problem with power transmission even if the chain is inclined, noise is unlikely to occur, and there is no problem with the strength. Yes, the price is cheaper.
[0008]
In order to prevent the link chain from contacting at the crossing point by providing a crossing loop portion formed by crossing the middle of such a link chain, the driving chain wheel and the driven chain wheel are axially moved. The drive mechanism is configured by being shifted. In this case, one of the chain wheels is disposed as close as possible to the rotation surface directly below the turntable, and the other chain wheel is disposed at a position below the turntable so as not to protrude to the side. Therefore, it is possible to arrange the other chain wheel higher than the one chain wheel, so that it is possible to make the configuration very compact.
[0009]
As the link chain that can be used in the present invention, for example, a link chain used for chain blocks is suitable, and a chain for a chain sling specified in JIS B8816 is optimal. This link chain is used together with a chain wheel for a link chain, a so-called chain wheel.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a driving mechanism in the reversing device of the present invention will be described with reference to the illustrated example. FIG. 1 is a front view of a reversing device 10 for handling heavy objects. A rotating table 13 having a circular outer peripheral portion as a rotating surface 11, and article placement portions 12a and 12b inside the outer peripheral portion, and a rotating surface 11 are shown. And a base 15 rotatably supporting the turntable 13 by support rolls 14 and 14 in contact with the base. Stopping portions 16a and 16b are provided at both ends of the rotating surface where the rotating surface 11 intersects with the article placement portions 12a and 12b, and a range where the stoppers 17a and 17b provided on the base 15 respectively hit, in the illustrated example. It is rotatable by a rotation angle of 90 degrees. For example, an article placed on one placement section 12a can be moved to the other placement section 12b by rotation of the turntable 13 to change the direction.
[0011]
The rotation drive unit 20 includes one link chain 21 stretched along a circular outer peripheral portion, and two chain wheels 23 and 24 around which the link chain 21 is wound. Has a crossed loop portion 22 formed in a loop shape by crossing in the middle at a lower portion of the vehicle, and has a configuration in which two chain wheels 23 and 24 are arranged in the loop portion. One driven chain wheel 23 is arranged at the center of the turntable 13, and the other drive chain wheel 24 is located below the turntable 13, at the side upper portion of the driven chain wheel 23, and with the driven chain wheel 23. It is arranged at a position shifted in the axial direction, and is configured so that the link chain 21 does not come into contact with the crossing portion 25. See FIG. 2, FIG. 3 and FIG.
[0012]
FIG. 5 shows the chain wheels 23 and 24 and the link chain 21. The link chain 21 is specified in JISB8816. The chain wheel has the same shape and structure for the tooth portion that meshes with the link chain 21 for both the driven and the driven. FIGS. 5 and 6 show the form of the chain wheel. FIG. 6 (a) shows a driving chain wheel, and FIG. 6 (b) shows a driven chain wheel. A deep recess 27 for accommodating the chain link 21V is provided. Reference numeral 28 denotes a flange, and 29 denotes a keyway. The drive chain wheel 24 is connected to an output shaft of a speed reducer 30 that is a power device.
[0013]
As described above, the drive mechanism 20 applied to the reversing device 10 of the present invention has only the driven chain wheel 23 disposed in the lower center of the turntable 13, and the drive chain wheel 24 is displaced in the axial direction so that the link chain 21 is inclined. To form the cross loop portion 22 so that the cross portion 25 does not come into contact with the cross loop portion 22. The link chain 21 has the structural strength specified by JIS, has a welded structure unlike conventional roller chains, and enables the inclined chain, so that the number of parts is small and the configuration is simple.
[0014]
【The invention's effect】
Since the present invention is configured and operates as described above, it is possible to reliably transmit the height of the chain drive mechanism and the outer dimensions of the width support without increasing the size, and in particular, to use one link chain. Is used to create a cross loop part, which is composed of one driving chain wheel and one driven chain wheel, so it is simple and can embody a configuration that could not be realized with a conventional roller chain. It has the effect of being able to do it.
[Brief description of the drawings]
FIG. 1 is a front view of a reversing device to which a driving mechanism according to the present invention is applied.
FIG. 2 is a plan view of a base according to the first embodiment;
FIG. 3 is a side view of the same.
FIG. 4A is an explanatory view of a link chain.
(B) Explanatory drawing which shows the crossing loop part of FIG.
FIG. 5 is a sectional view of a chain wheel according to the present invention.
FIG. 6A is a sectional view of the drive chain wheel taken along line AA.
(B) BB sectional drawing in a drive chain wheel.
(C) CC sectional drawing in a driven side chainwheel.
(D) DD sectional drawing in a driven side chain wheel.
FIG. 7A is an explanatory view showing Example 1 for describing a drive mechanism of the present invention.
(B) Explanatory drawing which shows Example 2 for description of the drive mechanism of this invention.
FIG. 8A is an explanatory view showing Example 1 of a conventional driving mechanism.
(B) Explanatory drawing which shows Example 2 of the conventional drive mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Reversing device 11 Rotating surface 13 Turntable 14 Support roll 20 Drive mechanism 21 Link chain 22 Crossover loop part 23 Follower chainwheel 24 Drive chainwheel 25 Crossover part

Claims (1)

A rotary table having a circular outer peripheral portion serving as a rotating surface, and having a mounting portion of the article inside the outer peripheral portion, a support roll in contact with the rotating surface and rotatably supporting the rotary table, In a reversing device provided with a rotation drive unit having a chain stretched along an outer peripheral portion and a chain wheel around which the chain is wound, a link chain is used as the chain, and a crossover formed by crossing the middle of the link chain. A drive mechanism in a reversing device having a configuration in which a loop portion is provided, and a drive chain wheel and a driven chain wheel are displaced in an axial direction so that a link chain does not contact at a crossing portion.

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